package thread;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * @author DBX
 * @effect 线程池
 *          线程池是线程的管理机制，它主要解决两个问题
 *              1.控制线程数量
 *              2.重用线程
 * @date 2021/09/16/17:04
 */
public class ThreadPoolDemo {
    public static void main(String[] args) {
        ExecutorService threadPool = Executors.newFixedThreadPool(2);
        for (int i = 0; i < 5; i++) {
            Runnable r = new Runnable() {
                @Override
                public void run() {
                    Thread t = Thread.currentThread();
                    System.out.println(t+":开始执行任务");
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println(t+"：执行完毕");
                }
            };
            threadPool.execute(r);
            System.out.println("将一个任务交给了线程池");
        }
            threadPool.shutdown();
            System.out.println("线程池停止了");
    }
}
